Quick meaning
An isolated environment where software runs without affecting the rest of the device.
Think of it like this
Like a children's sandpit — what happens inside stays inside and cannot mess up the garden.
Where you may see this
You may see this inside app stores, app settings, software updates, and install instructions.
Why it matters
Knowing the term helps you understand what an app is asking you to do before you tap, install, or change anything.
Say it simply
Sandbox means: An isolated environment where software runs without affecting the rest of the device.